I used to catch big garter, king, gofer and bull snakes and let them loose underneath the armstrong solar cabin years ago. Had a very positive affect on the mice and pack rat problem. Even the big pack rats would rather not tangle with a 60" bull snake.

But...the snakes had the nagging ability to crawl up in bed with you when it got cold inside. Cute fellows; we never had a problem with any biting us. Another idea is to borrow someones ferrets and let them run around inside your Bus Conversion. HB of CJ